Is this for ukulele? I've suggested an edit to add the uke tag.
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Bradd SzonyeApr 17 '14 at 22:58

3

There are no chromatic scales here. All you are seeing are seven different voicings for a B major chord on the ukulele. Take note of the numbers on the left of each marking, indicating the frets.
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NReilingh♦Apr 17 '14 at 22:59

3 Answers
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A major chord is a triad of three notes: the root note, the major third, and the perfect fifth. For the B major chord, the notes are B, D♯, and F♯.

Any combination of those three notes on your strings will form a B major chord. If the lowest note played is a B, the chord is in root position; otherwise, the chord is an inversion, which changes the character of the sound. When playing solo ukulele, this will depend partly on whether you use high G or low G tuning.

Which fingering you use in practice depends on what other chords or notes you play, as it’s easier to transition between some fingerings. Different neck positions and fingerings can also produce subtle differences in tone. Skilled listeners will be able to tell the difference between chord voicings, but they are all still “B major” chords.

Each of the examples in your fingering chart show exactly which frets to play on each string to create those three notes. The fret numbers are on the left side of the chart, and the notes to play are shown above the strings. For example, in the first fingering, you play B on the fourth fret of the G string, D♯ on the third fret of the C string, F♯ on the second fret of the E string, and B on the second fret of the A string. In the very last fingering, you play on the F♯, B, and D# on the 11th frets, and B on the 14th fret. These two fingerings will play the chord in different octaves, with different inversions, but they are both still B major chords.

I'm not sure what you mean by “chromatic scales” here. On the G string, each fret plays a different note: 1=G♯, 2=A, 3=A♯, 4=B, 5=C, 6=C♯, 7=D, 8=D♯, 9=E, 10=F, 11=F♯, 12=G. You can use that string to play any of the notes in a B-major chord: fret 4 for the B, fret 8 for the D♯, fret 11 for the F#. Does that help? Should I edit some of this into the answer?
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Bradd SzonyeApr 17 '14 at 23:29

I have updated my answer to include some information about how to read the fingering chart. I hope it helps you. If you still don't understand, you may need to get somebody to help you with the basics of playing your ukulele, including how to read fingering charts.
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Bradd SzonyeApr 17 '14 at 23:43

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Cleaned up comments - as Bradd says, you may wish to work on the absolute basics first...
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Dr Mayhem♦Apr 19 '14 at 9:26

You ask 'Why are there different fingerings JUST for the B chord'. If that's what you meant, there are just as many fingerings for MOST chords. The examples shown are different mixes of the 3 notes needed for a major chord. If you look carefully,the 2nd and the 3rd diagrams actually have the same 3 notes on the same 3 strings on the same 3 frets (exactly as a guitar,top 4 strings, but in a different key),but obviously the fingerings will be different. Check others and you will see similar pattern copying.